CVE-2023-47534
📋 TL;DR
This vulnerability allows attackers to execute arbitrary code or commands on Fortinet FortiClientEMS systems by exploiting improper neutralization of formula elements in CSV files. Attackers can achieve this by sending specially crafted packets. All organizations running affected versions of FortiClientEMS are at risk.
💻 Affected Systems
- Fortinet FortiClientEMS
📦 What is this software?
Forticlient Endpoint Management Server by Fortinet
View all CVEs affecting Forticlient Endpoint Management Server →
Forticlient Endpoint Management Server by Fortinet
View all CVEs affecting Forticlient Endpoint Management Server →
Forticlient Endpoint Management Server by Fortinet
View all CVEs affecting Forticlient Endpoint Management Server →
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise leading to complete control over the FortiClientEMS server, potential lateral movement within the network, and data exfiltration.
Likely Case
Remote code execution allowing attackers to install malware, create backdoors, or disrupt endpoint management operations.
If Mitigated
Limited impact with proper network segmentation and strict access controls preventing exploitation attempts.
🎯 Exploit Status
The vulnerability requires specially crafted packets but appears to be exploitable without authentication based on the description.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions 7.2.3, 7.0.11, 6.4.10, 6.2.10, 6.0.9 and later
Vendor Advisory: https://fortiguard.com/psirt/FG-IR-23-390
Restart Required: Yes
Instructions:
1. Download the patched version from Fortinet support portal. 2. Backup current configuration. 3. Install the update following Fortinet's upgrade guide. 4. Restart the FortiClientEMS service.
🔧 Temporary Workarounds
Network Access Restriction
allRestrict network access to FortiClientEMS management interface to trusted IP addresses only.
CSV Import Disable
allDisable CSV file import functionality if not required for operations.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate FortiClientEMS from untrusted networks
- Deploy intrusion detection/prevention systems to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check FortiClientEMS version in web interface or CLI. If version falls within affected ranges, system is vulnerable.Check Version:
In FortiClientEMS CLI: get system status | grep VersionVerify Fix Applied:
Verify version is 7.2.3, 7.0.11, 6.4.10, 6.2.10, 6.0.9 or later after patching.📡 Detection & Monitoring
Log Indicators:
- Unusual CSV file processing errors
- Unexpected process execution from FortiClientEMS service
- Failed authentication attempts followed by CSV operations
Network Indicators:
- Unusual network traffic to FortiClientEMS management ports
- CSV file uploads from unexpected sources
SIEM Query:
source="forticlientems" AND (event="csv_import" OR event="file_processing") AND result="failure"